12
Digital Ground Resistance Tester Model 4500
3.4
Influence of Stray Voltage
2
20 200 2 k 20 k
2 mA
10 mA
50 mA
Ω
Ω
Range
Test
Current
Table 2
Shaded areas indicate the ranges in which measurements can be
performed, where 40V, 50/60Hz peak-to-peak stray voltage is present,
without obtaining error levels representing more than 0.5% of the
measurement range.
3.5
Influence of Auxiliary Resistances
In the absence of stray signals, the maximum values for (Rx+Rz) which will
allow measurements to be performed, are those indicated within Table 3.
Range
Current
50 mA
10 mA
2 mA
(*)
Rx + Rz = 600
Ω
max
Rx + Rz = 4000
Ω
max
Rx + Rz = 20 k
Ω
max
2
Ω
20
Ω
200
Ω
2 k
Ω
20 k
Ω
(*)
(*)
Do not use
Table 3
* Even if auxiliary resistance of Rz = 0, the maximum reading is < 2000-counts on these three
ranges (voltage limiting circuit at output terminals).
